<template>
  <div class="todo-footer" v-show="total" >
        <label>
          <input type="checkbox" :checked="isAll" @change="checkAll"/>
        </label>
        <span>
          <span>已完成{{doneTotal}}</span> / 全部{{total}}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
      </div>
</template>

<script>
export default {
name:'MyFooter',
props:['todos','checkAllTodo','clearAllTodo'],
computed:{
  total(){
    return this.todos.length;
  },
  doneTotal(){
    let i=0;
    this.todos.forEach((todo)=>{
      if(todo.done==true){
        i++
      }
    })
    return i;
  },
  isAll(){
    return this.total===this.doneTotal && this.total!=0
  }
  },
  methods:{
    checkAll(e){
      this.checkAllTodo(e.target.checked);
    },
    clearAll(){
      this.clearAllTodo();
    }
  }

}
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>